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111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin
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* 2020 Otto-von-Guericke-Universität Magdeburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_msp430_common
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* @{
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*
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* @file
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* @brief ISR related functions
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*
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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* @author Oliver Hahm <oliver.hahm@inria.fr>
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* @author Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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*
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*/
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#ifndef IRQ_ARCH_H
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#define IRQ_ARCH_H
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#include <stdbool.h>
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#include <msp430.h>
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#include "irq.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* gcc warns for missing NOPs before/after interrupt enable/disable.
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* so I added the NOP instructions, even though they might not be necessary
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* due to following AND. // Kaspar
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*/
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extern volatile int __irq_is_in;
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#define _GENERAL_INTERRUPT_ENABLE (0x0008)
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__attribute__((always_inline)) static inline unsigned int irq_disable(void)
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{
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unsigned int state;
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__asm__ volatile(
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"mov.w r2, %[state]" "\n\t"
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"bic %[gie], r2" "\n\t"
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"nop" "\n\t"
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"and %[gie], %[state]" "\n\t"
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: [state] "=r"(state)
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: [gie] "i"(_GENERAL_INTERRUPT_ENABLE)
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: "memory"
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);
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return state;
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}
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__attribute__((always_inline)) static inline unsigned int irq_enable(void)
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{
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unsigned int state;
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__asm__ volatile(
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"mov.w r2, %[state]" "\n\t"
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"nop" "\n\t"
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"bis %[gie], r2" "\n\t"
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"nop" "\n\t"
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"and %[gie], %[state]" "\n\t"
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: [state] "=r"(state)
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: [gie] "i"(_GENERAL_INTERRUPT_ENABLE)
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: "memory"
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);
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return state;
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}
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__attribute__((always_inline)) static inline void irq_restore(unsigned int state)
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{
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__asm__ volatile(
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"bis %[state], r2" "\n\t"
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"nop" "\n\t"
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: /* no outputs */
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: [state] "r"(state)
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: "memory"
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);
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}
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__attribute__((always_inline)) static inline bool irq_is_in(void)
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{
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return __irq_is_in;
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}
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__attribute__((always_inline)) static inline bool irq_is_enabled(void)
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{
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unsigned int state;
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__asm__ volatile(
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"mov.w r2,%[state]" "\n\t"
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: [state] "=r"(state)
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: /* no inputs */
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: "memory"
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);
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return (state & GIE);
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}
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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#endif /* IRQ_ARCH_H */
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